TTL is the amount of routers your packages will go through. E.g. if it is 64, the first router will decrease it to 63, the second to 62 and so on. If the datagram reaches a TTL 0 it gets dropped, this is a security measure against loops in the internet. Your TTL value is certainly not responsible for your slow internet connection, so changing it will have no effect.
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Georg SchöllyDec 7 '11 at 9:42